Silicon Shore. Silicon Beach. Silicon Roundabout. How many different technology hubs can we have? Like the untethering of manufacturing from regional natural resources that crushed the Rust Belt, Silicon Valley's one-time advantage of a high concentration of venture capitalists matters less and less as the cost of technology falls.

The loss of the U.S. Airways hub signaled the start of Pittsburgh's remarkable turnaround. Does that make United Airlines' departure from Cleveland Hopkins International Airport a cause for celebration?